Weird packet loss problem

I have a problem with playing ranked, after like 5 normal matches my packet loss strikes up to almost 100, if I live for long it decreases to 15 but if we get in a fight they rise up again, you may think that I have internet (or maybe PC) problem, and I thought so too, but the weird part of this is that I have them ONLY (and I mean that literally) ONLY in ranked, in public or wildcard - absolute 0, Idk what is this but I'm hella annoyed, I tried making my graphics lower (ik packet loss is not about graphics but still I tried everything) but nothing works, I never had this problem before, it started after like season 12 or smth, even tho I play from release and never had it before that time, maybe someone knows how to fix this?